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Smart Windows That Separate Light From Heat

Researchers use nanotechnology for new techniques that could cut your cooling and heating bills

By

Daniel Akst

Aug. 28, 2015 1:52 p.m. ET

Modern windows can do a decent job of saving energy by keeping indoor and outdoor climates apart, but they have some big shortcomings.

It is tough, for example, to reap the benefit of sunlight streaming through a window without also taking in the sun’s heat, which isn’t welcome on a steamy summer day. Conversely, that same heat—so desirable in winter—comes with light whether you want it or not. If only windows could control heat and light independently—and at a low enough cost that this feature could be used in all kinds...

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